Pinning by the local changes of the electron mean free path in anisotropic type-II superconductors
Lj. Dobrosavljević-Grujić
DOI 10.1103/PhysRevB.36.1899 · Physical Review B
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Abstract
The bulk pinning force density Fp and the critical current jc of a dirty type-II superconductor, with spatially varying electron mean free path l along a given direction, are calculated using the Ginzburg-Landau-Abrikosov theory. In high fields the critical force density Fc is proportional to (1-B/Bc2)2(B/Bc2)m, where 0<m<1, but depends also on the size and form of inhomogeneity (grain boundary, dislocation wall, etc.) which causes the change of l. This may explain deviations from straight lines in the ‘‘Kramer plots’’ of jc1/2B1/4 versus B/Bc2 and the approximate scaling of Fc when the temperature is changed.
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